Vasilyev, Sergey, & Galina Olegovna Tzareva. " USING SINGULAR PERTURBATED SYSTEMS OF DIFFERENCIAL EQUATIONS OF INFINITE ORDER FOR COUNTABLE MARKOV CHAINS ANALYSIS." Современные информационные технологии и ИТ-образование [Онлайн], 12.1 (2016): 15-20. Веб. 5 May. 2024